RecyclerView被延遲顯示其項目

我從其數據存儲在Firebase數據庫中的對象填充RecyclerView。 RecyclerView顯示當前正在使用該應用程序的用戶。雖然RecyclerView在顯示屏關閉並再次打開之前不會顯示它們，但是所有數據都可以正確讀取。一旦顯示屏開啓，RecyclerView就會填充其項目。我使用調試來找出問題。在調試時它可以很好地工作但是當涉及到運行應用程序時，問題會回來。如果有人能夠幫助我解決這個高度讚賞的問題。我已經在下面發佈了我的代碼。RecyclerView被延遲顯示其項目

protected void onStart() { 
    super.onStart(); 
    mClient.connect(); 
    childEventListener = tempUserRef.addChildEventListener(new ChildEventListener() { 
     @Override 
     public void onChildAdded(DataSnapshot dataSnapshot, String s) { 
      if (dataSnapshot.exists()) { 
       UserDetailsClass userDetailsClass = dataSnapshot.getValue(UserDetailsClass.class); 

       if (!userDetailsClass.getUserID().equals(UserDetails.getString("UniqueID", "ID"))) { 
        myFriendsAdapter.refillAdapter(userDetailsClass); 
       } 
       if (userDetailsClass.getUserID().equals(UserDetails.getString("UniqueID", "ID"))) { 
        sender = userDetailsClass.getName(); 
       } 
      } 
     } 

     @Override 
     public void onChildChanged(DataSnapshot dataSnapshot, String s) { 

     } 

     @Override 
     public void onChildRemoved(DataSnapshot dataSnapshot) { 

     } 

     @Override 
     public void onChildMoved(DataSnapshot dataSnapshot, String s) { 

     } 

     @Override 
     public void onCancelled(DatabaseError databaseError) { 

     } 
    }); 

}

適配器類別

public class MyFriendsAdapter extends RecyclerView.Adapter<MyFriendsAdapter.MyFriendsViewHolder> { 

Context context; 
ClickListener clickListener; 
List<UserDetailsClass> friendsList; 

public MyFriendsAdapter(Context context, List<UserDetailsClass> friendsList) { 
    this.context = context; 
    this.friendsList = friendsList; 
} 

@Override 
public MyFriendsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    MyFriendsViewHolder viewHolder; 
    LayoutInflater inflater = LayoutInflater.from(parent.getContext()); 
    View view = inflater.inflate(R.layout.friend_online, parent, false); 
    viewHolder = new MyFriendsViewHolder(view); 
    return viewHolder; 
} 

@Override 
public void onBindViewHolder(MyFriendsViewHolder holder, int position) { 
    TextView name = holder.getName(); 
    name.setText(friendsList.get(position).getName()); 
    holder.getStateName().setText(friendsList.get(position).getStateName()); 
    setOnlineStatus(holder, position); 
} 

private void setOnlineStatus(MyFriendsViewHolder holder, int position) { 
    if (friendsList.get(position).getOnline_offline_status() == 1) { 
     holder.getOnline_offline().setText("Online"); 
     holder.getOnline_offline().setTextColor(Color.GREEN); 
    } 
} 

@Override 
public int getItemCount() { 
    if (friendsList == null) { 
     return 0; 
    } else { 
     return friendsList.size(); 
    } 
} 

public void refillAdapter(UserDetailsClass userDetailsClass) { 
    friendsList.add(userDetailsClass); 
} 

public void cleanUp() { 
    friendsList.clear(); 
} 

public void setClickListener(ClickListener clickListener) { 
    this.clickListener = clickListener; 
} 

class MyFriendsViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener { 

    private TextView name; 
    private TextView online_offline; 
    private TextView stateName; 
    private TextView distance; 

    public MyFriendsViewHolder(View itemView) { 
     super(itemView); 
     name = (TextView) itemView.findViewById(R.id.textView3); 
     online_offline = (TextView) itemView.findViewById(R.id.online); 
     stateName = (TextView) itemView.findViewById(R.id.textView4); 
     distance = (TextView) itemView.findViewById(R.id.textView13); 
     itemView.setOnClickListener(this); 

    } 

    public TextView getName() { 
     return name; 
    } 

    public void setName(TextView name) { 
     this.name = name; 
    } 

    public TextView getOnline_offline() { 
     return online_offline; 
    } 

    public void setOnline_offline(TextView online_offline) { 
     this.online_offline = online_offline; 
    } 

    public TextView getStateName() { 
     return stateName; 
    } 

    public void setStateName(TextView stateName) { 
     this.stateName = stateName; 
    } 

    public TextView getDistance() { 
     return distance; 
    } 

    public void setDistance(TextView distance) { 
     this.distance = distance; 
    } 

    @Override 
    public void onClick(View view) { 
     if (clickListener != null) { 
      String name = friendsList.get(getPosition()).getName(); 
      clickListener.itemClick(view, getPosition(), name); 
      //friendsList.get(getPosition()).getName(); 
     } 
    } 

} 

public interface ClickListener { 

    void itemClick(View view, int position, String name); 
} 

}

來源

2016-09-03 Panduka Wedisinghe

你忘了打電話給notifydatasetchanged（）之後添加 –

聽起來像一個答案@ColdFire :-) –

@FrankvanPuffelen啊這是一個 –

正如你可以看到你還沒有添加方法後添加notifydatasetchanged()，你需要通知你已經通過

來源

2016-09-03 15:43:34

謝謝你的回答，它完美的工作 –

使用填充與從火力地堡數據RecyclerView列表中的項目，最好的辦法是使用FirebaseRecyclerAdapter。看看這些指令的詳細信息：

FirebaseUI-database

來源

2016-09-03 14:28:12

您是將產品添加適配器缺少notifyDataSetChanged()

要麼把它添加到這裏：

if (!userDetailsClass.getUserID().equals(UserDetails.getString("UniqueID", "ID"))) { 
    myFriendsAdapter.refillAdapter(userDetailsClass); 
    myFriendsAdapter.notifyDataSetChanged(); 
}

或點擊這裏：

public void refillAdapter(UserDetailsClass userDetailsClass) { 
    friendsList.add(userDetailsClass); 
    notifyDataSetChanged(); 
} 

public void cleanUp() { 
    friendsList.clear(); 
    notifyDataSetChanged(); 
}

來源

2016-09-03 19:51:39 thismytime

RecyclerView被延遲顯示其項目

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